Improvement in drawer-locks



W. H. TAYLOR. L v Drawer Look.

No. 197,910. Patented Dec. 4,1877

W] YW'ESSES 1.7V VENILOR N. PETERS) PHDTO-LITHOGRAPHER. WASMINGTOM B 04UNITED. STATES PATENT OFFICE.

WARREN H. TAYLOR, OF STAMFORD, CONNECTICUT, AS SIGNOR TOTHE YALE LOCKMANUFACTURING COMPANY, OF SAME PLACE.

lMPROVEME NT 1 DRAWER-LOCKS.

Specification forining part of Letters Patent No. 197,910, datedDecember 4,1877; application filed 7 September 13, 1877.

To all whom it may concern Be it known that I, WARREN H. TAYLOR,

of Stamford, in the county of Fairfield and patented to me February 1,1876, No. 172,899, and comprehends a spring-lock with, an inrprovedconstruction of talon for throwing and stopping the lock-bolt, and animproved construction of the nosing orkey-barrel, as herein set forth.

In the accompanying drawings, Figure 1 is a perspective view of a keysuitably notched for the lock shown. Fig. 2 is a view of the inner sideof the lock, with the bolt thrown forward in the locked position and thecap removed to show more fully the working parts; Fig. 3, a similarview, showing the bolt retracted or in the unlocked position; Fig. 4, alike View, showing the bolt in the snubbed or half-lockedposition; 'Fig.5, a view of the inner side of the lock with the cap in place; Fig. 6, asectional view 011 the line 1 1 of Fig. 5; Fig. 7, a plan view of thecap with the keybarrel or nosing removed, and showing clearly themortises Fig. 8, a bottom view of the keybarrel, showing the tenons;Fig. 9, a transverse central section through the cap and keybarrel shownin Figs. 7 and 8; Fig. 10, a plan view of a cap, showing another methodof forming the lnortises to that shown in Fig. 7.

A indicates the lock-case, B the cap carrying the nosing or key-barrelC, D the springtumblers, E the bolt, and F the bolt-spring, which partsneed not be more particularly described.

Instead of forming the talon of an irregularshaped bent lever, pivotedat one side of the key-pivot, as shown in my said patent, I form it of aring or annular disk, Gr, provided with a pin or projection, g, to bestruck by the keybits, and also with three cams, a b 0, two of which, aand b, engage loosely in correspondin g notches in the lock'bolt, andthe third, 0,

bearsagainst the spring, H, which thus acts upon the cam-ring incoincidence with the action of' the bolt-spring, as is apparent from thedrawings. The peculiarity of this camring is in the two cams a and b andthe corre spond-ing notches in the bolt, in which they fit loosely, sothat in the operation of the lock they are alternately withdrawn fromthese notches, as and for a purpose which I will now particularlydescribe.

Referring to Fig. 2 of the drawings, which represents the lock-bolt inthe advanced or locked position, where the springs always tend to keepit, it will be observed that the cam. 11 is in engagement with its notchin the bolt. When the key is inserted. and turned for unlocking, the camc strikes thespring H, the cam b throws the bolt part way, when itslides out of its notch, and the cam a enters its notch, engages withthe bolt, and continues its movement to the unlocked position, as

shown in Fig. 3. The operation is like that of a pinion and rack, exceptthat the cams and notches are not so closely fltted and adjusted as togive the bolt a continuous motion. The

cam a does not strike the lug or partition as between the bolt-notchesuntil the cam b has slipped out of its notch, so that the movement ofthe bolt is slightly intermittent. Under the pressure of its spring it,in fact, for an instant, reverses its movement and meets the advancingcam a. The result is, that the cam 12 passes-by its notch, so that whenthe force applied inturning the key is released, and the cam-spring andbolt-spring tend to restore'the parts to the locked position, the cam 12will not return to its notch, because that, by theis closed. Having buta short distance to move for complete retraction, little difficulty isexperienced, little force is required, and

' greater certainty of action is secured. As the bolt is snubbed back tothe full unlocked position, the notch of the cam bis carried intocoincidence with it; the cam-ring spring then turns the cam into itsnotch, and there remains no longer any obstacle to the complete forwardthrow of the bolt. The action of the springs, accordingly, fully locksthe lock, and all the parts assume the position shown in Fig. 2.

I form the non-rotating nosing or key-barrel of two tubes, one rigidlyincased within the other. The external tube K, made of thindrawn brasstubing, is burnished over at the outer end, and within it is the tube L,similarly headed, so as to leave an annular inwardly-projecting ledge,which is notched 011 opposite sides. Between these heads or ledges isplaced the rotating slotted disk M. The key can be inserted andwithdrawn only when the slot in the disk and the notches in the innerledge are coincident, and then the lock-bolt is always in the locked orhalf -locked position, ready to be looked upon the closing of thedrawer. The key-barrel may be secured to the cap-plate in a suitableaperture by brazing but instead of this the cap may be provided with twomortises, as shown in Fig. 7. When this is done I make the outer tubelonger than the inner, and cut away a portion of its lower end to formtenons n n to fit the mortises.

I sometimes form my mortises by first cutting a partly-circular hole inthe cap, and then formingv and fitting into it a piece, 0, with notcheson each side, as shown in Fig. 10, the key-hole in the center of theapplied piece being of even diameter with the bore of the inner tube.

I cast my lock-case with suitable posts and projections for securing thebolt, tumblers, and springs in place, as is usual in the manufacture oflocks.

Having thus described my improvements, what I claim as my invention, anddesire to secure by Letters Patent, is

l. A ring or annular disk for a lock, provided on its periphery with twobolt-cams for alternate engagement with the lock-bolt, and with a thirdcam to be operated on by a spring,

and having within its margin a pin or projection to be struck by thekey-bit to turn the ring concentrically with the key, and thus throw thelockbolt, substantially as described.

2. The combination of a three'cammed ring or disk with a bolt,bolt-spring, and camspring, whereby, when the unlocking has beenperformed by the key and its turning force has been withdrawn, the boltgvill assume and be held in the half-locked position for snubbing andautomatically locking when the drawer is closed, substantially asdescribed.

3. A non-rotating nosing or key-barrel of a WARREN H. TAYLOR.

Witnesses:

E. D. OGDEN, Jr., CHAS. E. VAIL.

